Driven by their migration, the herd crosses the river's edge.
When the pressure mounts from the herd pushing from the back, the ones in front are forced into the river.
It's like a dam break.
And the croc has its pick of prey.
It has up to 68 pointed teeth that it uses to catch and latch onto its prey.
But it can't tear and chew its meal.
Instead, it thrashes and spins to rip apart pieces.
Then swallows the pieces whole.
When the rains come and the river isn't the only source of water, easy kills become rare.
But the croc has one more trick.
It can slow down its own metabolism, so when food is scarce, it can fast for months.
